Automatic dimming and color adjusting panel lamp circuit

Abstract

The utility model discloses an automatic dimming and color adjusting panel lamp circuit, which comprises a controller, an ambient light sensing circuit, a dimming circuit, a color adjusting circuit and an LED lamp circuit, and is characterized in that the ambient light sensing circuit is connected with the controller, and the controller is used for acquiring brightness information through the ambient light sensing circuit; the dimming circuit is connected with the controller; the color adjusting circuit is connected with the dimming circuit and the controller. The controller is connected with the dimming circuit and the color adjusting circuit, the LED lamp circuit is connected with the color adjusting circuit, the controller is used for outputting a PWM control signal according to the brightness information to control the dimming circuit and the color adjusting circuit, and dimming and color adjusting control is carried out on the LED lamp circuit through the dimming circuit and the color adjusting circuit, so that the luminance and color temperature of the LED lamp circuit are adjusted to a set illumination range. In this way, the lamplight can be automatically adjusted and controlled according to the ambient light brightness, and the high-precision requirement for jewelry lamplight illumination in a shop is met.

Description

Technical Field

[0001] This utility model relates to the field of lighting circuit technology, and in particular to an automatic dimming and color-adjusting panel light circuit. Background Technology

[0002] Light-emitting diodes (LEDs) possess outstanding advantages such as high luminous efficiency, low energy consumption, long lifespan, recyclable materials, and excellent dimming performance. Therefore, LEDs are widely used in the lighting field as a green and efficient light source. Existing luminaires typically consist of a lamp panel and a dimming power supply. The lamp panel mainly comprises one or more LED chips. The dimming power supply provides the power to the lamp panel for dimming. Since the luminous intensity of an LED chip is usually linear with its current, the brightness can be controlled by adjusting the supply current of the dimming power supply during dimming.

[0003] In existing lighting dimming technologies, the dimming of the lamp panel is mainly adjusted via buttons or a remote control. The adjusted light is usually at a fixed brightness and cannot be automatically adjusted according to the ambient light; therefore, users need to manually adjust the dimming based on the ambient light level, which is relatively cumbersome. Utility Model Content

[0004] The present invention aims to at least partially solve one of the technical problems in the related art. Therefore, one objective of the present invention is to provide an automatic dimming and color-adjusting panel light circuit.

[0005] To achieve the above objectives, the automatic dimming and color-adjusting panel light circuit according to an embodiment of the present invention includes:

[0006] Controller;

[0007] An ambient light sensing circuit is provided, which is connected to the controller, and the controller is used to obtain brightness information through the ambient light sensing circuit.

[0008] A dimming circuit, which is connected to the controller;

[0009] A color adjustment circuit, which is connected to both the dimming circuit and the controller;

[0010] The LED lamp circuit is connected to the color adjustment circuit. The controller is used to output a PWM control signal according to the brightness information to control the dimming circuit and the color adjustment circuit. The dimming circuit and the color adjustment circuit control the LED lamp circuit to adjust the brightness and color temperature of the LED lamp circuit to the set illumination range.

[0011] Furthermore, according to one embodiment of the present invention, the automatic dimming and color-adjusting panel light circuit further includes:

[0012] An infrared receiving circuit includes an infrared receiver connected to the controller. The controller receives infrared control signals through the infrared receiving circuit and performs dimming and color-adjusting control on the LED lamp circuit according to the infrared control signals.

[0013] Furthermore, according to one embodiment of the present invention, the ambient light sensing circuit includes:

[0014] Photodiode D1, the cathode of which is connected to the power supply VCC, and the anode of which is connected to the reference ground through resistor R1;

[0015] Transistor Q1, the base of transistor Q1 is connected to the anode of photodiode D1, the emitter of transistor Q1 is connected to reference ground, and the collector of transistor Q1 is connected to power supply VCC through resistor R3. The collector of transistor Q1 is also used to output a light intensity detection signal.

[0016] Furthermore, according to one embodiment of the present invention, the ambient light sensing circuit further includes:

[0017] An integrated operational amplifier U2 is provided. The non-inverting input of the integrated operational amplifier U2 is connected to the collector of the transistor Q1. The non-inverting input of the integrated operational amplifier U2 is also connected to the reference ground through a resistor R5. The inverting input of the integrated operational amplifier U2 is also connected to one end of a resistor R2 and one end of a resistor R4. The other end of a resistor R4 is connected to the reference ground. The other end of a resistor R2 is connected to the output of the integrated operational amplifier U2. The integrated operational amplifier U2 is connected to the two height information detection terminals of the controller.

[0018] Furthermore, according to one embodiment of the present invention, the dimming circuit includes:

[0019] A constant current controller U3, wherein the power supply terminal of the constant current controller U3 is connected to the power supply VBUS through a resistor R21, and the dimming control terminal PWM of the constant current controller U3 is connected to a control terminal of the controller.

[0020] Inductor L1, one end of which is connected to the adjustment control terminal Drain of the constant current controller U3, and the other end of which is connected to the dimming terminal LED- of the LED lamp circuit;

[0021] Capacitor C6, one end of which is connected to the other end of inductor L1, and the other end of capacitor C6 is connected to power supply VBUS;

[0022] Diode D3, the anode of diode D3 is connected to one end of inductor L1, and the cathode of diode D3 is connected to power supply VBUS;

[0023] A current sensing resistor R26 is provided, one end of which is connected to the current sensing terminal of the constant current controller U3, and the other end of which is connected to the reference ground.

[0024] Furthermore, according to one embodiment of the present invention, the color-correcting circuit includes:

[0025] A first color-tuning control circuit is connected to the first color-tuning control terminal of the controller and the LED lamp circuit, respectively, so as to adjust the first color temperature of the LED lamp circuit under the control of the controller.

[0026] The second color temperature control circuit is connected to the second color temperature control terminal of the controller and the LED lamp circuit, respectively, so as to adjust the second color temperature of the LED lamp circuit under the control of the controller.

[0027] Furthermore, according to one embodiment of the present invention, the first color-matching control circuit includes:

[0028] Transistor Q3, the base of transistor Q3 is connected to the first color control terminal IO1 of the controller through resistor R15, the emitter of transistor Q3 is connected to reference ground, the collector of transistor Q3 is connected to one end of resistor R13, the other end of resistor R13 is connected to one end of resistor R11, and the other end of resistor R11 is connected to power supply VBUS.

[0029] MOS transistor V2, the gate of which is connected to the common terminal of resistors R11 and R13, the source of which is connected to the power supply VBUS, and the drain of which is connected to the LED circuit.

[0030] Furthermore, according to one embodiment of the present invention, the second color-matching control circuit includes:

[0031] Transistor Q2, the base of transistor Q2 is connected to the second color control terminal IO2 of the controller through resistor R16, the emitter of transistor Q2 is connected to reference ground, the collector of transistor Q2 is connected to one end of resistor R14, the other end of resistor R14 is connected to one end of resistor R12, and the other end of resistor R12 is connected to power supply VBUS;

[0032] MOS transistor V1, the gate of which is connected to the common terminal of resistors R11 and R13, the source of which is connected to the power supply VBUS, and the drain of which is connected to the LED circuit.

[0033] Furthermore, according to one embodiment of the present invention, the LED lamp circuit includes:

[0034] The first color LED light strip is provided with one or more first color LED light strips, and the color adjustment terminal of each first color LED light strip is connected to the first color adjustment control circuit.

[0035] The second color LED light strip has one or more strips, and the color adjustment terminal of each second color LED light strip is connected to the second color adjustment control circuit. The dimming terminals of the first color LED light strip and the second color LED light strip are respectively connected to the dimming terminal LED- of the dimming circuit.

[0036] The automatic dimming and color-tuning panel light circuit provided in this embodiment of the invention is connected to the controller via an ambient light sensing circuit. The controller is used to acquire brightness information through the ambient light sensing circuit. A dimming circuit is connected to the controller. A color-tuning circuit is connected to both the dimming circuit and the controller. An LED light circuit is connected to the color-tuning circuit. The controller outputs a PWM control signal based on the brightness information to control the dimming circuit and the color-tuning circuit. The dimming circuit and the color-tuning circuit control the dimming and color-tuning of the LED light circuit to adjust its brightness and color temperature to a set illumination range. Thus, automatic adjustment and control of the light can be achieved based on ambient light intensity, meeting the high-precision lighting requirements of jewelry stores. Attached Figure Description

[0037] Figure 1 The structural block diagram of the automatic dimming and color-adjusting panel light circuit provided by this utility model;

[0038] Figure 2 A schematic diagram of the controller, ambient light sensing circuit, and infrared receiving circuit provided by this utility model;

[0039] Figure 3 A schematic diagram of the dimming circuit structure provided by this utility model;

[0040] Figure 4 A schematic diagram of the color matching circuit structure provided by this utility model;

[0041] Figure 5 A schematic diagram of the LED lamp circuit structure provided by this utility model.

[0042] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] See Figure 1 This utility model provides an automatic dimming and color-tuning panel light circuit, including: a controller, an ambient light sensing circuit, a dimming circuit, a color-tuning circuit, and an LED light circuit. The ambient light sensing circuit is connected to the controller, and the controller is used to obtain brightness information through the ambient light sensing circuit. The dimming circuit is connected to the controller. The color-tuning circuit is connected to both the dimming circuit and the controller. The LED light circuit is connected to the color-tuning circuit. The controller is used to output a PWM control signal according to the brightness information to control the dimming circuit and the color-tuning circuit. The dimming circuit and the color-tuning circuit control the dimming and color-tuning of the LED light circuit to adjust the luminous brightness and color temperature of the LED light circuit to a set illumination range.

[0046] like Figure 1As shown, the automatic dimming and color-tuning panel light circuit can be installed inside the lamp fixture. The ambient light sensing circuit detects information such as ambient light brightness and outputs this information to the controller. After receiving the brightness information, the controller determines whether the brightness has reached a preset value. If not, a PWM modulation signal is output to the dimming and color-tuning circuits. This allows the dimming and color-tuning circuits to control the LED light circuit, adjusting its brightness and color temperature to the set illumination range, thus meeting the required lighting requirements. In one embodiment of this invention, the lamp fixture with this automatic dimming and color-tuning panel light circuit can be used for lighting jewelry display cases. This allows for light adjustment based on the ambient light brightness of the jewelry display case, meeting the high-precision lighting requirements of jewelry in a store.

[0047] See Figure 1 Figure 2 The automatic dimming and color-adjusting panel light circuit further includes an infrared receiving circuit. The infrared receiving circuit includes an infrared receiver connected to the controller. The controller receives infrared control signals through the infrared receiving circuit and performs dimming and color-adjusting control on the LED light circuit based on the infrared control signals. Figure 2 As shown, the infrared receiver is installed on interface IR1. It receives remote control signals from the infrared remote control and outputs them to the controller via the IRdat signal terminal. The controller can then receive these signals, which can be dimming or color-adjusting signals. This allows the user to control the dimming and color-adjusting of the LED light circuit via the remote control. For example, the brightness of the LED light circuit can be adjusted to an initial level according to lighting requirements. The ambient light sensor circuit can detect ambient light in real time and output the detection results to the controller. The controller can then adjust and control the LED light circuit in real time, maintaining the lighting brightness within a set range to meet the required illumination levels. For example, this can meet the lighting requirements of jewelry stores.

[0048] See Figure 2 The ambient light sensing circuit includes a photodiode D1 and a transistor Q1. The cathode of the photodiode D1 is connected to the power supply VCC, and the anode of the photodiode D1 is connected to a reference ground through a resistor R1. The base of the transistor Q1 is connected to the anode of the photodiode D1, the emitter of the transistor Q1 is connected to the reference ground, and the collector of the transistor Q1 is connected to the power supply VCC through a resistor R3. The collector of the transistor Q1 is also used to output a light intensity detection signal. Figure 2As shown, light can be detected by the photodiode D1, and the conduction current of the photodiode D1 is linearly related to the light intensity. Thus, the light signal can be converted into a current signal, which is then amplified and output by the transistor Q1.

[0049] like Figure 2 As shown, the ambient light sensing circuit may further include: an integrated operational amplifier U2, the non-inverting input of which is connected to the collector of the transistor Q1, the non-inverting input of which is also connected to a reference ground via a resistor R5, the inverting input of which is connected to one end of a resistor R2 and one end of a resistor R4, the other end of which is connected to a reference ground, and the other end of which is connected to the output of the integrated operational amplifier U2. The integrated operational amplifier U2 is connected to the two height information detection terminals of the controller. The integrated operational amplifier U2 can form a linear amplifier circuit, which can further isolate and amplify the output signal of the transistor Q1 before outputting it to the controller to meet the signal detection requirements of the controller.

[0050] See Figure 3 The dimming circuit includes: a constant current controller U3, an inductor L1, a capacitor C6, a diode D3, and a current sensing resistor R26. The power supply terminal of the constant current controller U3 is connected to the power supply VBUS through the resistor R21, and the dimming control terminal PWM of the constant current controller U3 is connected to a control terminal of the controller. One end of the inductor L1 is connected to the adjustment control terminal Drain of the constant current controller U3, and the other end of the inductor L1 is connected to the dimming terminal LED- of the LED lamp circuit. One end of the capacitor C6 is connected to the other end of the inductor L1, and the other end of the capacitor C6 is connected to the power supply VBUS. The anode of the diode D3 is connected to the first end of the inductor L1, and the cathode of the diode D3 is connected to the power supply VBUS. One end of the current sensing resistor R26 is connected to the current sensing terminal of the constant current controller U3, and the other end of the current sensing resistor R26 is connected to the reference ground.

[0051] like Figure 3 As shown, the dimming circuit constitutes a BUCK constant current circuit, where diode D3 is a freewheeling diode, and inductor L1 and capacitor C6 are voltage regulation and filtering components, respectively. The constant current controller U3 detects the current in the circuit through current sensing resistor R26 and adjusts the control based on the circuit current to ensure the stability of the output current. The magnitude of the current in the dimming circuit can be controlled by the controller outputting a PWM signal. Since the brightness of an LED lamp is typically linearly related to the current, the brightness can be adjusted by regulating the overall circuit current of the LED lamp.

[0052] See Figure 4 The color-tuning circuit includes a first color-tuning control circuit and a second color-tuning control circuit. The first color-tuning control circuit is connected to the first color-tuning control terminal of the controller and the LED lamp circuit, respectively, to adjust the first color temperature of the LED lamp circuit under the control of the controller. The second color-tuning control circuit is connected to the second color-tuning control terminal of the controller and the LED lamp circuit, respectively, to adjust the second color temperature of the LED lamp circuit under the control of the controller. By mixing the light from two different colored LEDs, a light with a certain color temperature can be produced, making the color temperature of the light more suitable for lighting requirements.

[0053] The LED light circuit includes: a first-color LED strip and a second-color LED strip. The first-color LED strip has one or more strips, and the color adjustment terminal of each first-color LED strip is connected to the first color adjustment control circuit. The second-color LED strip has one or more strips, and the color adjustment terminal of each second-color LED strip is connected to the second color adjustment control circuit. The dimming terminals of the first-color LED strip and the second-color LED strip are connected to the dimming terminal LED- of the dimming circuit.

[0054] like Figure 4 As shown, the first color-tuning control circuit includes: a transistor Q3 and a MOSFET V2. The base of transistor Q3 is connected to the first color-tuning control terminal IO1 of the controller through a resistor R15. The emitter of transistor Q3 is connected to a reference ground. The collector of transistor Q3 is connected to one end of a resistor R13. The other end of resistor R13 is connected to one end of a resistor R11. The other end of resistor R11 is connected to the power supply VBUS. The gate of MOSFET V2 is connected to the common terminal of resistors R11 and R13. The source of MOSFET V2 is connected to the power supply VBUS. The drain of MOSFET V2 is connected to the LED lamp circuit.

[0055] Specifically, the first color-tuning control circuit operates as follows: the controller outputs a PWM signal with a certain duty cycle through the IO1 signal terminal. When the PWM signal is high, transistor Q3 and MOSFET V2 are turned on, supplying power to the LED circuit. Under the dimming circuit, the LED circuit outputs a constant current, causing the LED beads to emit light. When the PWM signal is low, transistor Q3 and MOSFET V2 are turned off, extinguishing the LED beads. By adjusting the duty cycle of this PWM signal, the average current of the LED circuit can be adjusted. This further adjusts the average current on the first-color LED strip, thereby further controlling the brightness of the first-color LED strip.

[0056] See Figure 4 The second color-tuning control circuit includes: a transistor Q2 and a MOSFET V1. The base of transistor Q2 is connected to the second color-tuning control terminal IO2 of the controller through a resistor R16. The emitter of transistor Q2 is connected to a reference ground. The collector of transistor Q2 is connected to one end of a resistor R14. The other end of resistor R14 is connected to one end of a resistor R12. The other end of resistor R12 is connected to the power supply VBUS. The gate of MOSFET V1 is connected to the common terminal of resistors R11 and R13. The source of MOSFET V1 is connected to the power supply VBUS. The drain of MOSFET V1 is connected to the LED lamp circuit.

[0057] Specifically, similar to the operation of the first color-tuning control circuit, the second color-tuning control circuit can further adjust and control the average current on the second-color LED strip, thereby further adjusting and controlling the brightness of the first-color LED strip. Further adjustment of the color temperature of the lamp can be achieved by mixing the two colors of light.

[0058] The above are merely embodiments of this utility model, but do not limit the patent scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes and variations are within the protection scope of the present invention.

Claims

1. An automatic dimming and color-tuning panel light circuit, characterized by, It comprises: a controller; ambient light sensing circuit, the ambient light sensing circuit is connected with the controller, the controller is used for obtaining brightness information through the ambient light sensing circuit; dimming circuit, the dimming circuit is connected with the controller; color adjusting circuit, the color adjusting circuit is connected with the dimming circuit and the controller respectively; LED lamp circuit, the LED lamp circuit is connected with the color adjusting circuit, the controller is used for outputting PWM control signal according to the brightness information to control the dimming circuit and the color adjusting circuit, and the LED lamp circuit is controlled by the dimming circuit and the color adjusting circuit to adjust the luminous brightness and color temperature of the LED lamp circuit to the set illumination range.

2. The automatic dimming-tint panel light circuit of claim 1, wherein, It also comprises: infrared receiving circuit, the infrared receiving circuit comprises an infrared receiver, the infrared receiver is connected with the controller, the controller is used for receiving infrared control signal through the infrared receiving circuit, and the LED lamp circuit is controlled by the dimming circuit and the color adjusting circuit according to the infrared control signal.

3. The automatic dimming-tint panel lamp circuit of claim 1, wherein, The ambient light sensing circuit comprises: a photodiode D1, the cathode of the photodiode D1 is connected with the power supply VCC, and the anode of the photodiode D1 is connected with the reference ground through the resistor R1; a triode Q1, the base of the triode Q1 is connected with the anode of the photodiode D1, the emitter of the triode Q1 is connected with the reference ground, the collector of the triode Q1 is connected with the power supply VCC through the resistor R3, and the collector of the triode Q1 is also used for outputting light brightness detection signal.

4. The auto-dimming toning panel lamp circuit of claim 3, wherein, The ambient light sensing circuit further comprises: an integrated operational amplifier U2, the noninverting input terminal of the integrated operational amplifier U2 is connected with the collector of the triode Q1, the noninverting input terminal of the integrated operational amplifier U2 is also connected with the reference ground through the resistor R5, the inverting input terminal of the integrated operational amplifier U2 is also connected with one end of the resistor R2 and one end of the resistor R4 respectively, the other end of the resistor R4 is connected with the reference ground, the other end of the resistor R2 is connected with the output terminal of the integrated operational amplifier U2, and the integrated operational amplifier U2 is connected with the two brightness information detection terminals of the controller.

5. The auto-dimming tonable faceplate lamp circuit of claim 1, wherein, The dimming circuit comprises: a constant current controller U3, the power supply end of the constant current controller U3 is connected with the power supply VBUS through the resistor R21, and the dimming control end PWM of the constant current controller U3 is connected with a control end of the controller; an inductor L1, one end of the inductor L1 is connected with the adjusting control end Drain of the constant current controller U3, and the other end of the inductor L1 is connected with a dimming end LED- of the LED lamp circuit; a capacitor C6, one end of the capacitor C6 is connected with the other end of the inductor L1, and the other end of the capacitor C6 is connected with the power supply VBUS; a diode D3, the anode of the diode D3 is connected with the one end of the inductor L1, and the cathode of the diode D3 is connected with the power supply VBUS; A current detection resistor R26, one end of the current detection resistor R26 is connected with the current detection end of the constant current controller U3, the other end of the current detection resistor R26 is connected with the reference ground.

6. The auto-dimming toning panel lamp circuit of claim 5, wherein, The color adjusting circuit comprises: A first color adjusting control circuit, the first color adjusting control circuit is connected with the first color adjusting control end of the controller and the LED lamp circuit respectively, so as to adjust the LED lamp circuit under the control of the controller to the first color temperature; A second color adjusting control circuit, the second color adjusting control circuit is connected with the second color adjusting control end of the controller and the LED lamp circuit respectively, so as to adjust the LED lamp circuit under the control of the controller to the second color temperature.

7. The auto-dimming tonable faceplate lamp circuit of claim 6, wherein, The first color adjusting control circuit comprises: A transistor Q3, the base of the transistor Q3 is connected with the first color adjusting control end IO1 of the controller through the resistor R15, the emitter of the transistor Q3 is connected with the reference ground, the collector of the transistor Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with one end of the resistor R11, the other end of the resistor R11 is connected with the power supply VBUS; A MOS tube V2, the gate of the MOS tube V2 is connected with the common end of the resistor R11 and the resistor R13, the source of the MOS tube V2 is connected with the power supply VBUS, the drain of the MOS tube V2 is connected with the LED lamp circuit.

8. The auto-dimming tonable faceplate lamp circuit of claim 7, wherein, The second color adjusting control circuit comprises: A transistor Q2, the base of the transistor Q2 is connected with the second color adjusting control end IO2 of the controller through the resistor R16, the emitter of the transistor Q2 is connected with the reference ground, the collector of the transistor Q2 is connected with one end of the resistor R14, the other end of the resistor R14 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the power supply VBUS; A MOS tube V1, the gate of the MOS tube V1 is connected with the common end of the resistor R11 and the resistor R13, the source of the MOS tube V1 is connected with the power supply VBUS, the drain of the MOS tube V1 is connected with the LED lamp circuit.

9. The auto-dimming tonable faceplate lamp circuit of claim 8, wherein, The LED lamp circuit comprises: A first color LED lamp strip, the first color LED lamp strip is provided with one or more, the color adjusting end of each first color LED lamp strip is connected with the first color adjusting control circuit respectively; A second color LED lamp strip, the second color LED lamp strip is provided with one or more, the color adjusting end of each second color LED lamp strip is connected with the second color adjusting control circuit respectively, the dimming end of the first color LED lamp strip and the second color LED lamp strip is connected with the dimming end LED of the dimming circuit respectively.

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